Roasting-furnace.



A. ZAVELBERG.

l ROASTING PURNAGB.

APPLIQATION FILED 14u14, 1914.

1,107,006, Patented Aug. 11, 1914 z SHEETS-SHEET 1.

WinESSES:

A. ZAVELBERG.

ROASTING FURNAGE.

APPLICATION PILE-D 11u14. 1914.

2 SHEBTB-SHEET 2.

Fig. 5.

W I n ALBERT zAvEnBERG, or HOHENLOHEHTTE, GERMANY.

ROASTING-FURNACE.

Specification of Letters Patent.

Patented Aug. 11, 1914.

Application led May 14, 1914. Serial No. 838,529.

T0 @LL whom it may concern:

Be it known that I, ALBERT ZAVELBERG, engineer, subject of the German Emperor, residing at Hohenlohehiitte, Silesia, Germany, have invented new and useful Improvements in Roasting-Furnaces, of which the following is a specification.

In roasting furnaces generally rotary rakes are employed for raking the charge, for turning the latter over, moving it into lower layers and finally conveying it to the dischargers. These known rakes, however, have the following disadvantages: The

known types, however, is rather difficult,k

particularly because they must be secured to the inner, central shaft. For instance, the raking arms are pushed into the furnace and engaged with devices provided on the said central shaft. Such exchanging of defective raking arms will, therefore, always necessitate a lengthy interruption of the work and thus represent a loss in time and money, in particular, because the furnace cools down during such interval and must then be started afresh. With the object of avoiding these disadvantages the rakes are, according to the present invention, fitted to a framework, traveling on the outside around the furnace and project from this framework through circular slots in the furnace wall into the furnace. The raking arms are thus constantly within the furnace. The frame work does not only serve to support the raking arms, but the motion of the frame work is at the same time the source of power for operating the raking arm.

As the raking operation produced according to the present invention is a continuous one, the slots, through which the raking arms project into the furnace have the shape of circular slots. The framework carrying the raking arms, furthermore serves as a support for the overhanging roofs of the roasting chambers.

In the accompanying drawing a constructional form of the present invention is exemplied.

Figure 1 is a vertical section through the furnace. Fig. 2 is a horizontal section on the line A-A in Fig. 1. Fig. 3 illustrates, on an enlarged scale, the method of forming the outsde joint of the raking arms. Fig. 4c is a top view of Fig. 3. Fig. 5 is a vertical section through another constructional form of the furnace. Fig. 6 illustrates the flues for the fire gases.

As an example, it shall be assumed that the furnace has three roasting levels a, a1 and a2. The charge is admitted through the hopper t, and conveyed by the worm c to top floor a of the furnace. Thence the charge is gradually raked to the lower levels, and finally it is, after completion of the roasting, discharged at d.

The raking arms e are fitted to a framework f, adapted to travel around the furnace, and project from this framework through circular slots g into the several floors of the furnace. By the traveling motion of the framework the raking arms e' are simultaneously drawn through t-he several levels of the furnace whereby the charge is raked and conveyed.

The roasting gases enter into the flue 7c and are then conducted twice around the furnace, reversing the direction of their flow. They then rise through the flue 761, pass down again through flue 7c3 and escape at c3.

The air is supplied through the flues 7a4, is heated by passing along the heating flues, then, thus heated, it flows through the roasting chambers and escapes through the flue c5.

Above the roasting levels a chamber is provided in which the fine dust and ashes shall collect. This chamber is provided with cleaning doors in the wall of the furnace. The framework f is moved by means of a gearing, a pinion n on the framework rolling on a rack 0.

The manner in which the raking arms e are jointed toward the outside is shown in Figs. 3 and 4. This object is obtained by jointing plates of an annular shape with bent over edges, s and s1 engaging in likewise annular gutters g extending around the whole periphery of the furnace and filled with sand and the like. The said plates are secured in a suitable manner to the raking arms.

In consequence of the arrangement of the raking arms .according to the present invention the roofs of the roasting chambers have to overhang and therefore require some support at their outer ends. vThis is obtained in the following manner. The ends of these roofs t are supported on the traveling framework jf. To the periphery of these roofs angles are secured. The lower flange w of which rides on rollers 17 or ball bearings, two of which are provided on each frame section for each level.

In Fig. 5 a somewhat different constructional form of the furnace according to the present invention is exemplified. Here a space within the furnace has been left clear to receive the traveling framework. This constructional form has the advantage that the framework has to bear a much smaller Weight, as, owing to the diameter of the furnace decreasing toward the center, the roofs of the, roasting chambers overhang for a shorter distance.

I claim:

l. Ina' roasting furnace the combination with a track encircling said furnace, of a plurality of horizontalvslots formed in the side of said furnace, a truck and its complemental tower mounted on said track,

rakes provided with slot closures mounted on said tower and adapted to enter Said slots, said rakes operated through medium of said traveling truck and tower, and means coacting with said frame to support said roof, substantially as described.

2. In a roasting furnace 'the combination of a track adjacent one wall thereof, a truck and its complemental tower, mounted on said track, roof projections for said furnace, means carried by said tower adapted to support said roof, longitudinal slots disposed within said wall adjacent said roof and rakes secured to said tower provided with movable closures for said slots, substantially as described.

3. In combination with a roasting furnace, longitudinal slots therein, rakes adapted to enter said furnace through said slots, independent traveling supporting members serving to carry said rakes, roof projections for said furnace, said members adapted to carry roof supports adapted to engage said projections, slot closures carried by said rakes, substantially as degcriliied.

In testimony whereof I have signed my name to this specification in the presence. of two subscribing witnesses.

ALBERT ZAVELBERG.

Witnesses:

FRANZ SAU'LI, VILHELM Gonrs.

Copies of this patent may beobtaned for ve cents each, by addressing the Commissioner of Patents,

' Washington, D. C. 

